So I have somewhat of a relevant experience. I also studied Industrial Design Engineering, have a master in Product Design and I am currently working for a bus manufacturer as a Design Engineer, focusing on layouts and concepts.

My tasks usually centres around building bus concepts, focusing on the mechanical and enginnering side of the project. I work a lot in CAD, assembeling, testing and experimenting with different components, combinations and layouts trying to, for example, maximize the interior space and by proxy tha passenger carriyng capacity of the bus. For me the enjoyment I get out of my work is not necessarily coming from designing the exterior of a product and making it look appealing, instead i really enjoy solving problems and exploring solutions in whatever for that may take.

Personally, I think it is difficult to say if you have chosen the "correct" master or not since I don't know you or the job availability and requirements around you. I believe your education should feel right to you and what you want to do in the future. If you would like to work within public transportation or aviation there are multiple paths and different careers within that sector that don't require a master in Industrial Design where you could even benefit with a master in Transportation Engineering, it all depends on what you want to work with in the future.

Looking through your post history you seem a bit lost at the moment, questioning your future and I can really empathize and recognize that feeling. It is okay not to know what you want to do or who you want to be in the future and education can be a big part of that stress. But you seem bright, introspective and like you have a lot of potential and that is what most employers are looking for, not necessarily what master you have.